<template>
  <div class="upload-file">
    <el-upload
      ref="upload"
      multiple
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :auto-upload="true"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      :disabled="flag"
      class="upload-file-uploader"
    >
      <!-- 上传按钮  根据shoubtn是否显示按钮 修改样式可将btn隐藏-->
      <el-button
        v-show="showBtn"
        size="mini"
        type="primary"
        :disabled="flag"
        ref="uploadBtn"
        >选取文件</el-button
      >
      <!-- 按钮右侧提示语 -->
      <slot name="customText"></slot>
      <!-- 上传提示 -->
      <div v-if="showTip" slot="tip" class="el-upload__tip">
        请上传
        <template v-if="fileSize">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >
      <li
        v-for="(file, index) in fileList"
        :key="file.url"
        class="el-upload-list__item ele-upload-list__item-content"
      >
        <!-- <el-link :href="file.url"
                 :underline="false"
                 target="_blank"> -->
        <span
          class="el-icon-document"
          style="cursor: pointer"
          @click="downloadClick(file)"
        >
          {{ file.name }}
        </span>
        <!-- </el-link> -->
        <div class="ele-upload-list__item-content-action">
          <el-link
            :underline="false"
            type="danger"
            v-if="!flag"
            @click="handleDelete(index)"
            >删除</el-link
          >
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import { downloadFile } from "@/api/file/file-view";

export default {
  name: "FileUpload",
  props: {
    // 值
    value: [String, Object, Array],
    // 数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["doc", "xls", "ppt", "txt", "pdf", "bat", "sh"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
    // 按钮标识
    flag: {
      type: Boolean,
      default: false,
    },
    showBtn: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      uploadFileUrl:
        process.env.VUE_APP_BASE_API + "/trial-file/infra/file/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
    };
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  watch: {
    // 'fileList': {
    //   handler (old, val) {
    //     if (val) {
    //       this.$emit('fileChange', true)
    //     }
    //   },
    //   deep: true,
    // }
    // value: {
    //   handler (val) {
    //     if (val) {
    //       let temp = 1
    //       // 首先将值转为数组
    //       const list = Array.isArray(val) ? val : this.value.split(',')
    //       // 然后将数组转为对象数组
    //       this.fileList = list.map(item => {
    //         if (typeof item === 'string') {
    //           item = { name: item, url: item }
    //         }
    //         item.uid = item.uid || new Date().getTime() + temp++
    //         return item
    //       })
    //     } else {
    //       this.fileList = []
    //       return []
    //     }
    //   },
    //   deep: true,
    //   immediate: true
    // }
  },
  methods: {
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        const isTypeOk = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
        if (!isTypeOk) {
          this.$modal.msgError(
            `文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`
          );
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传文件，请稍候...");
      this.number++;
      return true;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError(err) {
      this.$modal.msgError("上传失败，请重试");
      this.$modal.closeLoading();
    },
    // 上传成功回调
    handleUploadSuccess(res) {
      this.uploadList.push({
        name: res.data.name,
        path: res.data.path,
        url: res.data.url,
        fileId: res.data.fileId,
      });
      if (this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", this.fileList);
        this.$modal.closeLoading();
      }
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
      this.$emit("input", this.fileList);
      this.$emit("fileChange", true);
    },
    downloadClick(file) {
      downloadFile("18", file.fileId).then((res) => {
        const url = URL.createObjectURL(res);
        const elink = document.createElement("a");
        elink.download = file.name;
        elink.style.display = "none";
        elink.href = url;
        document.body.appendChild(elink);
        elink.click();
        // 释放URL 对象
        URL.revokeObjectURL(elink.href);
        document.body.removeChild(elink);
      });
    },
    // 统一更改为上传文件对象
    // 获取文件名称
    // getFileName (name) {
    //   if (name.lastIndexOf('/') > -1) {
    //     return name.slice(name.lastIndexOf('/') + 1)
    //   } else {
    //     return ''
    //   }
    // },
    // 对象转成指定字符串分隔
    // listToString (list, separator) {
    //   let strs = ''
    //   separator = separator || ','
    //   for (const i in list) {
    //     strs += list[i].url + separator
    //   }
    //   return strs != '' ? strs.substr(0, strs.length - 1) : ''
    // }
  },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
  width: 80%;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
